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Depends upon your controls. Many these days are using the Vision Pro thermostat as the dual fuel control. It will control a 2 stage heat pump but only 1 stage for backup so in gas heat mode, you'll have to use the timer to time 2nd stage on, a comfort disadvantage. I'm not sure if there is anything out there that could handle all 4 stages. Maybe the Infinity/Evolution could. calling dash

I called Carrier about the Infinity controller and could not get anyone that could tell me. The guy did tell me that he was "sure" that it would because it was the newest thing they had and was very advanced.

Oh - He also told me that the Infinity controller was satellite linked, so if I forgot my password they could send it a signal and unlock my system.

wow! That is really cool. What exactly does the link do? Will I be able to access my system from the internet or from a phone? Could I "call home" and change the program? Could I call home from vacation to check on the house? If the system broke could it call the repain company on its own?

Most of the time with two HP heating stages and two furnace heating stages, you don't really control all four stages. Typically you either use an outdoor thermostat somewhere, omit one of the stages, or use the furnace timer logic to control selection between low fire and high fire.